Question

91- Elimine os parenteses colchetes e chaves e reduza os termos semelhantes.
A) (3a²-5b)+(5a²+5b)
B)x²-{3x-[(x+3)+(x²-1]}
C)2y- [-3xy+(-2x+5y) - (-4y+x)

Answer 1

A) $(3 a^{2}-5b)+(5 a^{2} +5b) \\ 15 a^{2} +15 a^{2}b-25 a^{2} b -25 b^{2} \\ 15 a^{2}-10 a^{2}b -25 b^{2}$

B) $x^{2} -{3x-[(x+3)+( x^{2} -1]} \\ x^{2} -3x-[ x^{3} -x+3 x^{2} -3] \\ x^{2} -3x- x^{3}+x-3 x^{2} +3$
$\\ 4 x^{2} -2x- x^{3} +3 \\ 2 x^{2} - x^{3} +3$

C)$2y- [-3xy+(-2x+5y) - (-4y+x) \\ 2y-[(+3 x^{2} y-15x y^{2} ).(4y-x) \\ 2y-[12 x^{2} y^{2} +15 x^{2} y^{2} ] \\ 2y-[27 x^{2} y^{2} ] \\ 2y-27 x^{2} y^{2}$